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# ADR425BR-REEL7-RevB 데이터 시트보기 (PDF) - Analog Devices

 부품명 상세내역 제조사 ADR425BR-REEL7(RevB) Ultraprecision, Low Noise, 2.048 V/2.500 V/3.00 V/5.00 V XFET® Voltage References Analog Devices ADR425BR-REEL7 Datasheet PDF : 16 Pages
 1 2 3 4 5 6 7 8 9 10 Next Last PARAMETER DEFINITIONS Temperature Coefficient The change of output voltage over the operating temperature range and normalized by the output voltage at 25°C, expressed in ppm/°C. The equation follows: ( ) TCVO ppm / °C = VO (T2 ) –VO (T1 ) × 106 VO (25°C ) × (T2 – T1 ) where VO (25°C) = VO at 25°C VO (T1) = VO at Temperature 1 VO (T2) = VO at Temperature 2. Line Regulation The change in output voltage due to a specified change in input voltage. It includes the effects of self-heating. Line regulation is expressed in either percent per volt, parts-per-million per volt, or microvolts per volt change in input voltage Load Regulation The change in output voltage due to a specified change in load current. It includes the effects of self-heating. Load regulation is expressed in either microvolts per milliampere, parts-per-million per milliampere, or ohms of dc output resistance. Long-Term Stability Typical shift of output voltage at 25°C on a sample of parts subjected to operation life test of 1000 hours at 125°C: where ∆VO = VO(t0 ) – VO(t1) ∆VO ( ppm) = VO(t0 ) – VO(t1) VO (t0 ) × 106 VO (t0) = VO at 25°C at Time 0 VO (t1) = VO at 25°C after 1,000 hours operation at 125°C. ADR420/ADR421/ADR423/ADR425 Thermal Hysteresis Thermal hysteresis is defined as the change of output voltage after the device is cycled through temperature from +25°C to –40°C to +125°C and back to +25°C. This is a typical value from a sample of parts put through such a cycle. VO _ HYS = VO (25°C ) –VO _TC VO _ HYS ( ppm) = VO (25°C ) –VO _TC VO (25°C ) × 106 where VO (25°C) = VO at 25°C VO_TC = VO at 25°C after temperature cycle at +25°C to –40°C to +125°C and back to +25°C. Input Capacitor Input capacitors are not required on the ADR42x. There is no limit for the value of the capacitor used on the input, but a 1 µF to 10 µF capacitor on the input will improve transient response in applications where the supply suddenly changes. An additional 0.1 µF in parallel will also help to reduce noise from the supply. Output Capacitor The ADR42x does not need output capacitors for stability under any load condition. An output capacitor, typically 0.1 µF, will filter out any low-level noise voltage and will not affect the operation of the part. On the other hand, the load transient response can be improved with an additional 1 µF to 10 µF output capacitor in parallel. A capacitor here will act as a source of stored energy for sudden increase in load current. The only parameter that will degrade, by adding an output capacitor, is turn-on time and it depends on the size of the capacitor chosen. REV. B –5–